/Engine/Source/Developer/WidgetRegistration/Public/Layout/SeparatorBuilder.h
Initializes the size of the separator. If called after the widget creation (that is, a call to GenerateWidget) this call will have no effect.
thisFSeparatorBuilderto enable cascading.
[FSeparatorBuilder](API\Developer\WidgetRegistration\Layout\FSeparatorBuilder) & InitializeSize ( const [FSeparatorSize](API\Developer\WidgetRegistration\Layout\FSeparatorSize) & NewSize )